GenericDaoPropertyEditorRegistrarUnitTest.java

/*
 * Copyright 2008-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.synyx.hades.extensions.beans;

import static org.hamcrest.Matchers.*;
import static org.mockito.Matchers.*;
import static org.mockito.Mockito.*;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
import org.springframework.beans.PropertyEditorRegistry;
import org.springframework.context.ApplicationContext;
import org.synyx.hades.dao.GenericDao;


/**
 * Unit test for {@link GenericDaoPropertyEditorRegistrar}.
 * 
 * @author Oliver Gierke
 */
@RunWith(MockitoJUnitRunner.class)
public class GenericDaoPropertyEditorRegistrarUnitTest {

    GenericDaoPropertyEditorRegistrar registrar =
            new GenericDaoPropertyEditorRegistrar();
    @Mock
    ApplicationContext context;
    @Mock
    PropertyEditorRegistry registry;
    @Mock
    EntityDao dao;
    DomainClassPropertyEditor<Long> reference;


    @Before
    public void setup() {

        reference = new DomainClassPropertyEditor<Long>(dao, registry);
    }


    @Test
    public void addsDaoForEntityIfAvailableInAppContext() throws Exception {

        letContextContain(dao);
        registrar.setApplicationContext(context);
        registrar.registerCustomEditors(registry);

        verify(registry).registerCustomEditor(eq(Entity.class), eq(reference));
    }


    @Test
    public void doesNotAddDaoAtAllIfNoDaosFound() throws Exception {

        letContextContain(dao);
        registrar.registerCustomEditors(registry);

        verify(registry, never()).registerCustomEditor(eq(Entity.class),
                eq(reference));
    }


    private void letContextContain(Object bean) {

        Map<String, Object> beanMap = new HashMap<String, Object>();
        beanMap.put(bean.getClass().getName(), bean);

        when(context.getBeansOfType(argThat(is(subtypeOf(bean.getClass())))))
                .thenReturn(beanMap);
    }

    @SuppressWarnings("serial")
    private static class Entity implements Serializable {

    }

    private static interface EntityDao extends GenericDao<Entity, Long> {

    }


    private static <T> TypeSafeMatcher<Class<T>> subtypeOf(
            final Class<? extends T> type) {

        return new TypeSafeMatcher<Class<T>>() {

            public void describeTo(Description arg0) {

                arg0.appendText("not a subtype of");
            }


            @Override
            public boolean matchesSafely(Class<T> arg0) {

                return arg0.isAssignableFrom(type);
            }
        };
    }
}